-LRB- CNN -RRB- -- Willie Nelson is the latest act to cancel a concert at Orlando 's SeaWorld in the wake of CNN 's `` Blackfish '' documentary .

The legendary country singer 's decision comes after the Canadian rock band Barenaked Ladies pulled the plug on their show at the Florida theme park .

As with the Barenaked Ladies decision , Nelson 's cancellation may have been a response to an online petition started by fans on Change.org .

`` As a fan who respects his activism for animals , the environment , and other good causes , I find this very disappointing , '' Danielle Legg of Amherst , New York , wrote in her petition . `` If you 've seen the documentary Blackfish , you know why it 's so surprising . Please tell Willie Nelson you do not want him to support SeaWorld 's animal cruelty . ''

The petition gathered 9,000 signatures .

SeaWorld spokesman Nick Gollattscheck confirmed Nelson 's decision not to sing at SeaWorld , but he cited reasons other than the documentary and petition .

`` Due to scheduling conflicts , Willie Nelson will not be appearing at SeaWorld Orlando 's Bands , Brew & BBQ event in 2014 , '' Gollattscheck said in a statement e-mailed to CNN Thursday night .

Nelson and his representatives did not immediately respond to a CNN request for comment .

When the Barenaked Ladies nixed their plans to play at SeaWorld last week , they explained that it was a decision made after viewing `` Blackfish . ''

`` This is a complicated issue , and we do n't claim to understand all of it , but we do n't feel comfortable proceeding with the gig at this time , '' the band said on a Facebook post .

`` The Seaworld folks have been gracious , and extended us invitations to the park to learn more about what they do , and how they do it . ''

SeaWorld responds to questions about captive orcas , ` Blackfish ' film

A park spokesman told CNN that the Barenaked Ladies show had been taken off the theme park 's concert schedule .

The decision to cancel the band 's performance came two days after drummer Tyler Stewart posted a tweet saying the group is `` looking at options '' after viewing the documentary .

The documentary -- which first aired on CNN in October -- tells the story of the SeaWorld trainer who was killed in 2010 by an orca named Tilikum .

Fans launched an online petition asking the Barenaked Ladies to cancel . The group had just announced it would perform at SeaWorld 's Orlando park on February 15 during its `` Bands , Brew & BBQ '' events .

Mike Garrett of St. Catharines , Ontario , posted the petition on Change.org asking band members to watch `` Blackfish '' and `` learn how SeaWorld and other captive display facilities such as Marineland in Niagara Falls have for decades exploited marine mammals solely for profit . ''

Garrett said he was `` disappointed '' when he heard the group was scheduled to play there `` in light of all the horrific information we 're learning . ''

`` I 'm hoping to grab the band 's attention on this issue and ask them , on behalf of all their animal-loving fans , to reconsider performing there , '' Garrett wrote . His petition gained more than 9,200 signatures .

It worked .

`` We here at Barenaked Ladies have made a decision based on what we feel . It 's not about money , or petitions , or press ... But it is about our fans , '' the band said November 27 . `` We listen to them , and they 're important to us . ''

The park 's website does not list Barenaked Ladies on the schedule . February 15 and four other weekend dates just say `` Coming Soon . ''

Acts that are still listed on the calendar include Cheap Trick , REO Speedwagon , Martina McBride , 38 Special , Justin Moore and Scotty McCreery .

SeaWorld challenges ban limiting interaction between whale and trainer

CNN 's Jane Caffrey contributed to this report .

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An online petition urging Nelson to cancel the SeaWorld show got 9,000 signatures

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Nelson 's cancellation comes a week after the Barenaked Ladies canceled

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SeaWorld blames `` scheduling conflicts '' for the cancellations

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Fans who saw CNN 's `` Blackfish '' documentary posted petitions on Change.org